Light-emitting member, biological authentication device, wrist-band type electronic apparatus, and biological measurement device

Abstract

Provided is a light emitting member that emits near-infrared light, containing a surface light source that emits at least red light and a wavelength conversion film that converts visible light of the surface light source into near-infrared light, wherein the light emitting member has a maximum emission wavelength in the wavelength range of 700 to 1500 nm.

1 . A light emitting member that emits near-infrared light, comprising a surface light source that emits at least red light and a wavelength conversion film that converts visible light of the surface light source into near-infrared light, wherein the light emitting member has a maximum emission wavelength in the wavelength range of 700 to 1500 nm. 
     
     
         2 . The light emitting member described in  claim 1 , wherein the wavelength conversion film contains a luminescent dye. 
     
     
         3 . The light emitting member described in  claim 2 , wherein the luminescent dye is a squarylium compound, a croconium compound, or a thiadiazole compound. 
     
     
         4 . The light emitting member described in  claim 3 , wherein the squarylium compound is a compound having a structure represented by the following Formula (1), 
       
         
           
           
               
               
           
         
         in Formula (1), A and B respectively represent an aromatic hydrocarbon ring which may have a substituent, or an aromatic heterocycle which may have a substituent, and adjacent substituents may be bonded to each other to form a ring; and R 1  to R 4  respectively represent a substituent, at least one of R 1  to R 4  has an aromatic hydrocarbon ring, and R 1  to R 4  may be respectively bonded to each other to form a ring. 
       
     
     
         5 . The light emitting member described in  claim 4 , wherein the squarylium compound having a structure represented by Formula (1) is a compound having a structure represented by the following Formula (2), 
       
         
           
           
               
               
           
         
         In Formula (2), E 1  to E 4  respectively represent a substituent; m1 to m4 respectively represent 0 or an integer of 1 to 5; R and R′ respectively represent a substituent; and n and n′ respectively represent 0 or an integer of 1 to 3, provided that when m1 to m4, n and n′ are 2 or more, E 1  to E 4 , R and R′ may be the same or different. 
       
     
     
         6 . The light emitting member described in  claim 2 , wherein the wavelength conversion film contains two or more luminescent dyes. 
     
     
         7 . The light emitting member described in  claim 2 , wherein the wavelength conversion film contains two or more squarylium dyes. 
     
     
         8 . The light emitting member described in  claim 1 , wherein the surface light source is an organic electroluminescent element. 
     
     
         9 . The light emitting member described in  claim 1 , wherein the maximum emission wavelength obtained from the light emitting member is 780 nm or more. 
     
     
         10 . A biometric authentication device equipped with the light emitting member described in  claim 1 . 
     
     
         11 . A wristband electronic device equipped with the biometric authentication device described in  claim 10  so as to carry out biometric authentication by taking an image of a wrist vein. 
     
     
         12 . The wristband electronic device described in  claim 11 , wherein when the wristband electronic device is mounted to a wrist, a light source is provided in any area on a wristband of the wristband electronic device other than on the same plane as an imaging unit. 
     
     
         13 . A biometric device equipped with the light emitting member described in  claim 1 . 
     
     
         14 . The biometric device described in  claim 13 , being a pulse oximeter that performs measurement at a wrist or a base of a finger. 
     
     
         15 . The biometric device described in  claim 13 , being a pulse wave sensor that performs measurement at a wrist or a base of a finger.